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Development of a Diffusion Mobility Database for Co-based Superalloys



Greta Lindwall, Kil-Won Moon, Carelyn E. Campbell, Maureen E. Williams, Whitney Tso


To facilitate the development of high-temperature Co-based - superalloys, a Co-Ni based diffusion mobility database is developed for the eight component FCC (Face Centered Cubic) system of Co-Al-W-Ni-Cr-Ti-Ta-Re. A CALPHAD approach is used to represent the temperature and composition dependency of the multicomponent system. The mobility descriptions are based on previous assessment work for the Ni-based superalloys, published experimental and computational data, and established diffusion correlations. The initial mobility descriptions were then refined using additional diffusion couple experimental data, particularly for the Co-Cr, Co-Ta, and Ni-Ta systems. After re-optimizing the descriptions with the new experimental data, the mobility descriptions were validated using a collection of published diffusion couple composition profiles, which were not included in the initial assessment process.
Journal of Phase Equilibria and Diffusion


Co-based superalloys, diffusion, CALPHAD


Lindwall, G. , Moon, K. , Campbell, C. , Williams, M. and Tso, W. (2022), Development of a Diffusion Mobility Database for Co-based Superalloys, Journal of Phase Equilibria and Diffusion, [online],, (Accessed April 20, 2024)
Created November 27, 2022, Updated January 18, 2023